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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Diencephalon: Anatomical Regions01:30

Diencephalon: Anatomical Regions

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The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
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Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Indirect Motor Pathways01:22

Indirect Motor Pathways

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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Related Experiment Video

Updated: Mar 24, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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A GABAergic tecto-tegmento-tectal pathway in pigeons.

Martin Stacho1, Sara Letzner1, Carsten Theiss2

  • 1Department of Biopsychology, Faculty of Psychology, Institute of Cogntive Neuroscience, Ruhr-University Bochum, 44801, Bochum, Germany.

The Journal of Comparative Neurology
|March 19, 2016
PubMed
Summary

The pigeon brain

Keywords:
AB_2201526AB_258833AB_477329AB_477652GABARRIDs: AB_211712SciRes_000111nucleus of the lateral ponto-mesencephalic tegmentumparvalbuminretrograde and anterograde tracingsubstantia nigra; tecto-tectal interaction

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Area of Science:

  • Neuroscience
  • Comparative neuroanatomy
  • Avian neurobiology

Background:

  • Birds exhibit reciprocal inhibition between left and right optic tecta.
  • Mammalian superior colliculus receives inhibitory input from the substantia nigra pars reticulata (SNr).
  • Contralateral SNr projections are crucial for intertectal inhibition in mammals.

Purpose of the Study:

  • To investigate the role of the SNr in avian tecto-tectal inhibition.
  • To determine if the SNr acts as a relay in an indirect tecto-tectal pathway in pigeons.
  • To identify the neuronal substrate for inhibitory interactions between the optic tecta in birds.

Main Methods:

  • Bilateral anterograde and retrograde tracing in pigeons.
  • GABA immunohistochemistry to identify inhibitory pathways.
  • Histological analysis of neural projections and neurotransmitter markers.

Main Results:

  • The pigeon SNr projects ipsilaterally to the optic tectum, not contralaterally.
  • These SNr projections to the optic tectum are non-GABAergic.
  • A disynaptic inhibitory pathway involving a tegmental region was identified for contralateral optic tectal input.

Conclusions:

  • The SNr is not the primary relay for contralateral inhibitory tecto-tectal pathways in pigeons.
  • A novel disynaptic pathway, not involving the SNr, underlies avian tecto-tectal inhibition.
  • This pathway likely contributes to attentional shifts in birds with laterally placed eyes.